﻿/* Object */
if (!Object.keys) // IE < 9
{
    Object.keys = (function () {
        'use strict';
        var hasOwnProperty = Object.prototype.hasOwnProperty,
            hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'),
            dontEnums = [
              'toString',
              'toLocaleString',
              'valueOf',
              'hasOwnProperty',
              'isPrototypeOf',
              'propertyIsEnumerable',
              'constructor'
            ],
            dontEnumsLength = dontEnums.length;

        return function (obj) {
            if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) {
                throw new TypeError('Object.keys called on non-object');
            }

            var result = [], prop, i;

            for (prop in obj) {
                if (hasOwnProperty.call(obj, prop)) {
                    result.push(prop);
                }
            }

            if (hasDontEnumBug) {
                for (i = 0; i < dontEnumsLength; i++) {
                    if (hasOwnProperty.call(obj, dontEnums[i])) {
                        result.push(dontEnums[i]);
                    }
                }
            }
            return result;
        };
    }());
}

/* Array */
Array.prototype.contains = function (obj) {
    var i = this.length;
    while (i--) {
        if (this[i] === obj) {
            return true;
        }
    }
    return false;
}